Lithium-ion polymer batteries, or more commonly lithium polymer batteries (abbreviated Li-poly or LiPo) are rechargeable batteries which have technologically evolved from lithium-ion batteries. Ultimately, the lithium-salt electrolyte is not held in an organic solvent as in the lithium-ion design, but in a solid polymer composite such as polyacrylonitrile. There are many advantages of this design over the classic lithium-ion design, including the fact that the solid polymer electrolyte is not flammable (unlike the organic solvent that the Li-ion cell uses). Lithium-ion polymer batteries started appearing in consumer electronics around 1996.

At least they say LiPos aren't flammable

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Overcharging a Li-poly battery will likely result in explosion and/or fire. During discharge on load, the load has to be removed as soon as the voltage drops below approximately 3.0 V per cell (used in a series combination), or else the battery will subsequently no longer accept a charge.